ABB Relion 650 Series Product Manual page 52

Transformer protection RET650
Version 1.1 ANSI
Table 62. IEC Inverse time characteristics
Function
Operating characteristic:
æ ö
A
ç ÷
= ×
t td
( )
ç ÷
P
-
è ø
I 1
EQUATION1653 V1 EN-US
I = I /I
measured set
IEC Normal Inverse
IEC Very inverse
IEC Inverse
IEC Extremely inverse
IEC Short time inverse
IEC Long time inverse
Table 63. RI and RD type inverse time characteristics
Function
RI type inverse characteristic
1
= ×
t td
0.236
-
0.339
I
EQUATION1656 V1 EN-US
I = I /I
measured set
RD type logarithmic inverse
characteristic
æ ö
I
- ç × ÷
= 5.8 1.35 In
t
è ø
td
EQUATION1657 V1 EN-US
I = I /I
measured set
52
Range or value
td = (0.05-999) in steps of 0.01
A=0.14, P=0.02
A=13.5, P=1.0
A=0.14, P=0.02
A=80.0, P=2.0
A=0.05, P=0.04
A=120, P=1.0
Range or value
td = (0.05-999) in steps of 0.01
td = (0.05-999) in steps of 0.01
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1MRK 504 127-BUS B
Accuracy
-
IEC 60255-151, class 5 +
40 ms
Accuracy
IEC 60255-151, class 5 +
40 ms
IEC 60255-151, class 5 +
40 ms
ABB Power Grids